At first, the pigs seem to participate in the farm with the other animals, keeping to Old Major's view of pure animal equality. However, as time goes on, the pigs discover the fun and comfort of human habits such as beds and alcohol; they alter the rules of Animalism to allow themselves comforts while denying them to the other animals. When Napoleon makes his power-grab, he becomes directly violent, killing other animals both in paranoia and as examples to keep the others from rebelling. At the end of the novel, the pigs have set themselves up as surrogate humans, walking on two legs and using whips; the other animals, without a leader to incite new rebellion, find themselves more oppressed under the pigs than they ever were under Farmer Jones.
Really badly; they work them too hard, they decrease their rations and at the end start using whips just like Mr Jones did.